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<blockquote data-quote="cebbeler7" data-source="post: 6958715" data-attributes="member: 619293"><p>I have done my fair share of building sealed enclosures.&nbsp; I&#039;ve always done sealed, because I&#039;ve wanted sound quality more than boom boom.&nbsp; I&#039;m MECP certified so I&#039;m not necessarily an idiot, but they never exactly explained to me how to make a perfect ported box.&nbsp; On some subs you can get away with it by making a crappy one and it still booms, but I think this is going to be more of a challenge on getting all the lows I need to pump out of this.&nbsp; I attempted to build one box slot ported but my sub wouldn&#039;t hit the lows I know it can hit so this is where I need some advice.&nbsp; I am using 2 arc audio d2 flatlines.&nbsp; Here is the spec of the flatline if you don&#039;t know.&nbsp; <a href="http://www.arcaudio.com/productdescription_pages/subwoofers/flatline/fl12.asp" target="_blank">Arc Audio</a> .&nbsp; It&#039;s one of the only 12 in subs I know that can hit as low as a 15.&nbsp; I&#039;m using an arc audio ks1000.1bx amplifier that has a bass generator and I have a line driver to boost the voltage up to 10 V, plus a power cell.&nbsp; I know I have enough power for these subs and I&#039;m running the speaker wire parallel so that it&#039;s bridged down to 2 Ohms.&nbsp; So power is good, impedance is good, voltage is good.... now time for the box.&nbsp; A flatline requires about 2.5 cu feet ported.&nbsp; My box will be about 5 cu feet since I have two flatlines.&nbsp; ok simple math there.&nbsp; It will be 39 inches in length.&nbsp; 16 inches in height.&nbsp; 14 inches in width.&nbsp; So thats about 5 cubic feet right there.&nbsp; So plenty of air space.&nbsp; Now comes the issues I&#039;ve been stressing over.&nbsp; How long do they ports need to be?? I was thinking about putting two slot &#039;L&#039; ports on the ends of the box.&nbsp; Or the option of making just a big slot port in the middle.&nbsp; I need help on the port size and possibly shape.&nbsp; Someone please help, this has been driving me crazy.</p></blockquote><p></p>

[QUOTE="cebbeler7, post: 6958715, member: 619293"] I have done my fair share of building sealed enclosures. I've always done sealed, because I've wanted sound quality more than boom boom. I'm MECP certified so I'm not necessarily an idiot, but they never exactly explained to me how to make a perfect ported box. On some subs you can get away with it by making a crappy one and it still booms, but I think this is going to be more of a challenge on getting all the lows I need to pump out of this. I attempted to build one box slot ported but my sub wouldn't hit the lows I know it can hit so this is where I need some advice. I am using 2 arc audio d2 flatlines. Here is the spec of the flatline if you don't know. [URL="http://www.arcaudio.com/productdescription_pages/subwoofers/flatline/fl12.asp"]Arc Audio[/URL] . It's one of the only 12 in subs I know that can hit as low as a 15. I'm using an arc audio ks1000.1bx amplifier that has a bass generator and I have a line driver to boost the voltage up to 10 V, plus a power cell. I know I have enough power for these subs and I'm running the speaker wire parallel so that it's bridged down to 2 Ohms. So power is good, impedance is good, voltage is good.... now time for the box. A flatline requires about 2.5 cu feet ported. My box will be about 5 cu feet since I have two flatlines. ok simple math there. It will be 39 inches in length. 16 inches in height. 14 inches in width. So thats about 5 cubic feet right there. So plenty of air space. Now comes the issues I've been stressing over. How long do they ports need to be?? I was thinking about putting two slot 'L' ports on the ends of the box. Or the option of making just a big slot port in the middle. I need help on the port size and possibly shape. Someone please help, this has been driving me crazy. [/QUOTE]

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